CN114724817A - Inductor structure and power circuit - Google Patents
Inductor structure and power circuit Download PDFInfo
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- CN114724817A CN114724817A CN202210330906.4A CN202210330906A CN114724817A CN 114724817 A CN114724817 A CN 114724817A CN 202210330906 A CN202210330906 A CN 202210330906A CN 114724817 A CN114724817 A CN 114724817A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/255—Magnetic cores made from particles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
本发明提供一种电感结构及电源电路，包括：至少一个磁芯及N组绕组，每组所述绕组包括一个相输出线圈和一个相间耦合线圈；所述磁芯上设置有贯通孔，一组所述绕组的所述相输出线圈和所述相间耦合线圈均穿过同一所述贯通孔并分别绕设在所述贯通孔的两侧，一个所述磁芯上至少绕设一组所述绕组，各所述相间耦合线圈均位于所述磁芯的同一侧，各所述相输出线圈均位于所述磁芯的另一侧，所述相输出线圈与所述相间耦合线圈之间有绝缘设置；其中，N为大于等于2的自然数。本发明的电感结构的磁芯采用磁粉芯材料，并通过间接耦合的方式实现多路电感之间的负耦合，具有大电流应用的瞬态响应速度快、电感尺寸小、散热能力强等优点。
The invention provides an inductance structure and a power supply circuit, comprising: at least one magnetic core and N groups of windings, each group of the windings includes a phase output coil and an interphase coupling coil; The phase output coil and the interphase coupling coil of the winding pass through the same through hole and are respectively wound on both sides of the through hole, and at least one group of the windings is wound around one of the magnetic cores , each of the interphase coupling coils is located on the same side of the magnetic core, each of the phase output coils is located on the other side of the magnetic core, and an insulating arrangement is provided between the phase output coil and the interphase coupling coil ; where N is a natural number greater than or equal to 2. The magnetic core of the inductance structure of the present invention adopts magnetic powder core material, and realizes the negative coupling between multiple inductances by means of indirect coupling, and has the advantages of fast transient response speed, small inductance size, and strong heat dissipation capability for large current applications.
Description
Technical Field
The present invention relates to the field of semiconductor technologies, and in particular, to an inductor structure and a power supply circuit.
Background
The large current multi-path parallel connection has become the main structure of a Voltage Regulator Module (VRM) for supplying power to CPUs, servers and the like, and most of inductors used in the Voltage Regulator Module are ferrite inductors used in parallel. As shown in fig. 1, a single ferrite inductor 1 has a ferrite core 11, and a coil 12 wound around the core. The magnetic core has lower saturation magnetic flux density and low thermal conductivity, so that the design with smaller volume cannot be realized; when multiple paths of ferrite inductors are used in parallel, when a load of a certain path changes suddenly, other paths perceive the change slowly, and the current sharing among the paths is not easy to realize.
Therefore, how to reduce the size of the inductor and achieve current sharing among the branches when multiple paths are used side by side has become one of the problems to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an inductor structure and a power circuit, which are used to solve the problems of the prior art, such as large size of the inductor, slow sensing of each branch when multiple branches are used side by side, and the like.
To achieve the above and other related objects, the present invention provides an inductor structure, including:
the magnetic core comprises at least one magnetic core and N groups of windings, wherein each group of windings comprises a phase output coil and an interphase coupling coil;
the magnetic core is provided with a through hole, the phase output coils and the interphase coupling coils of a group of windings penetrate through the same through hole and are respectively wound on two sides of the through hole, at least one group of windings are wound on one magnetic core, each interphase coupling coil is positioned on the same side of the magnetic core, each phase output coil is positioned on the other side of the magnetic core, and the phase output coils and the interphase coupling coils are arranged in an insulating manner;
wherein N is a natural number of 2 or more.
Optionally, the interphase coupling coils are sequentially connected in series.
More optionally, the inter-phase coupling coils are sequentially connected in series through a connecting wire arranged on the surface of the magnetic core.
More optionally, the interphase coupling coils are connected in series in sequence by welding.
Optionally, the magnetic core is made of magnetic powder core material.
Optionally, be provided with the insulating piece in the perforating hole, in the perforating hole the looks output coil with the interphase coupling coil is located respectively the both sides of insulating piece.
Optionally, the phase output coil and/or the interphase coupling coil is/are externally wrapped by an insulating material layer.
More optionally, a line width of the phase output coil disposed outside the through hole is larger than a width of the through hole.
More optionally, the bottom of the magnetic core is a plane, and the phase output coil and the outlet end of the inter-phase coupling coil are attached to the bottom plane of the magnetic core.
More optionally, the inductance structure further includes a bobbin, and the phase output coil and the inter-phase coupling coil both pass through the bobbin, and are used to fix the relative positions of the phase output coil and the inter-phase coupling coil.
More optionally, the wire frame includes a fixing member and an insert disposed on a lower surface of the fixing member, the fixing member is disposed outside the through hole, and the insert is inserted into the through hole.
More optionally, the inductance structure further includes at least one additional coil and an additional through hole corresponding to the additional coil, the additional coil passes through the additional through hole and is wound around the magnetic core, the additional coil and the inter-phase coupling coil are located on the same side of the magnetic core, one end of the additional coil is connected in series to an input end or an output end of the inter-phase coupling coil, and the other end of the additional coil forms a new input end or a new output end.
To achieve the above and other related objects, the present invention further provides a power circuit, including the above inductor structure, the power circuit further including:
an output capacitor and N switch modules;
one end of each switch module receives input voltage, the other end of each switch module is connected with the first end of the corresponding phase output coil in the inductance structure, and the switch control of a power supply is realized based on the connection and disconnection of a switch; the second end of each phase of output coil is connected with the upper polar plate of the output capacitor; and all interphase coupling coils in the inductance structure are sequentially connected end to end.
Optionally, the switch module includes a first switch and a second switch; the first end of the first switch receives input voltage, and the second end of the first switch is connected with the first end of the corresponding output coil in the inductance structure; the first end of the second switch is connected with the second end of the first switch, and the second end of the second switch is grounded; the first switch and the second switch are opposite in switching state.
More optionally, the power supply circuit further includes a compensation inductor, and the compensation inductor is connected in series between any two phases of the inter-phase coupling coils.
As described above, the inductor structure and the power circuit of the present invention have the following advantages:
the magnetic core of the inductor structure adopts magnetic powder core materials, realizes negative coupling among multiple paths of inductors in an indirect coupling mode, and has the advantages of high transient response speed, small inductor size, strong heat dissipation capability and the like in large-current application.
Drawings
FIG. 1 is a schematic diagram of a ferrite inductor in the prior art;
fig. 2 is a first structural schematic diagram of an inductor structure according to the present invention;
fig. 3 is a schematic cross-sectional view of the inductor structure of fig. 2;
fig. 4 is a schematic bottom structure diagram of the inductor structure of fig. 2;
FIG. 5 is a second structural diagram of an inductor structure according to the present invention;
FIG. 6 is a schematic diagram of a power supply circuit of the present invention;
FIG. 7 is a schematic diagram of a third structure of an inductor structure according to the present invention;
fig. 8 is a diagram illustrating a fourth structure of the inductor structure according to the present invention;
fig. 9 is a schematic diagram of a fifth structure of the inductor structure of the present invention;
fig. 10 is a diagram illustrating a sixth exemplary inductor structure according to the present invention;
fig. 11 is a schematic diagram of a seventh structure of the inductor structure of the present invention.
Description of the element reference numerals
1 ferrite inductor
11 magnetic core
12 coil
2 inductance structure
21 magnetic core
22 winding
221-phase output coil
222 interphase coupling coil
22a first winding
221a first phase output coil
222a first inter-phase coupling coil
22b second winding
221b second phase output coil
222b second inter-phase coupling coil
23 insulating sheet
24 connecting line
25 wire frame
251 fixing piece
252 plug-in
26 additional coil
31 first switch module
32 second switch module
4 compensating inductance
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 2 to 11. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Example one
As shown in fig. 2, the present embodiment provides an inductance structure 2, where the inductance structure 2 includes:
at least one magnetic core 21 and N sets of windings, each set of windings comprising a phase output coil 221 and an interphase coupling coil 222; wherein N is a natural number of 2 or more. In this embodiment, N is set to 2, and in actual use, the value of N may be set as needed.
As shown in fig. 2, the core 21 is used for winding a coil.
Specifically, the magnetic core 21 is implemented by using a magnetic powder core material, and the magnetic powder core is a soft magnetic material formed by mixing and pressing ferromagnetic powder particles and an insulating medium, and has a saturation magnetic flux density higher than that of ferrite and lower thermal conductivity. As an example, the magnetic core 21 has a cubic structure.
In practical use, the shape of the magnetic core may be set as needed, but is not limited to this embodiment.
As shown in fig. 2, the through hole is provided in the core 21.
Specifically, in the present embodiment, the number of the through holes is set to 2. As shown in fig. 3, each through hole penetrates the magnetic core 21 from top to bottom; as an example, the through-hole has a rectangular cross section.
In actual use, the cross-sectional shape of the through-hole may be set as needed, and the present embodiment is not limited thereto.
As shown in fig. 2, the phase output coils and the inter-phase coupling coils of a set of windings all penetrate through the same through hole and are respectively wound on two sides of the through hole, at least one set of windings is wound on one magnetic core 21, each inter-phase coupling coil is located on the same side of the magnetic core 21, each phase output coil is located on the other side of the magnetic core 21, and an insulating arrangement is provided between each phase output coil and the inter-phase coupling coil.
Specifically, in the present embodiment, two sets of windings are provided, namely a first winding 22a and a second winding 22b, where the first winding 22a includes a first phase output coil 221a and a first inter-phase coupling coil 222a, and the second winding 22b includes a second phase output coil 221b and a second inter-phase coupling coil 222 b. The first winding 22a and the second winding 22b are respectively disposed in parallel in two through holes, and the phase output coil and the inter-phase coupling coil of the same winding set pass through the same through hole.
More specifically, in the present embodiment, the phase output coil 221 and the inter-phase coupling coil 222 in each set of windings are both arranged in a U shape according to the shape of the magnetic core 21; as shown in fig. 3, each of the phase output coil 221 and the inter-phase coupling coil 222 includes a first line segment disposed in the through hole, a second line segment disposed on the upper surface of the core 21, and a third line segment attached to the side wall of the core 21. Further, as an example, the phase output coil 221 is disposed in parallel with the second line segment of the inter-phase coupling coil 222. In practical use, the shapes of the phase output coil 221 and the inter-phase coupling coil 222 can be set based on the magnetic core 21, which is not described herein.
As shown in fig. 3, in the present embodiment, a gap is formed between the second line segment of the inter-phase coupling coil 222 and the magnetic core 21. The first line segment and the third line segment of the phase output coil 221 and the inter-phase coupling coil 222 are both provided with extension sections protruding out of the lower surface of the magnetic core 21, and the extension sections serve as wire outlet ends for electrical connection.
More specifically, as an example, the first winding 22a coincides with the arrangement direction of the second winding 22 b; the first phase output coil 221a and the second phase output coil 221b are located on the same side, and the first inter-phase coupling coil 222a and the second inter-phase coupling coil 222b are located on the other side. When the interphase coupling coils need to be connected in series for application, the interphase coupling coils can be connected in sequence on the PCB in a welding mode; alternatively, the inter-phase coupling coils may be directly connected in series during winding, and as shown in fig. 4, the bottom of the magnetic core 21 is further provided with a connecting wire 24 (the connecting wire 24 may be obtained in the winding process) for connecting the inter-phase coupling coils in series. And negative coupling is formed between the inter-phase coupling coils and the output coils of all phases after series connection, and the coupling coefficient is greater than 0.5.
It should be noted that the forming process of the magnetic core 21 includes, but is not limited to, a magnetic powder core assembling process after high-temperature sintering and an integral molding process in which the winding magnetic core is directly pressed together for molding. Fig. 2 and 4 show an integral molding process, and fig. 5 shows a magnetic powder core assembling process.
More specifically, as shown in fig. 3, in the present embodiment, an insulating sheet 23 is provided in the through hole, and the phase output coil 221 and the interphase coupling coil 222 in the through hole are located on both sides of the insulating sheet 23, so that the phase output coil 221 and the interphase coupling coil 222 are insulated. In another implementation manner, an insulating material layer is wrapped outside the phase output coil 221 and/or the interphase coupling coil 222, so that the phase output coil 221 and/or the interphase coupling coil 222 can be insulated; for example, the phase output coil 221 and the inter-phase coupling coil 222 are formed of enameled rectangular wires, and directly function as inter-winding insulation. Any method capable of realizing the insulating arrangement of the phase output coil 221 and the interphase coupling coil 222 is applicable to the present invention.
As shown in fig. 6, the present embodiment further provides a power circuit, where the power circuit includes an inductor structure with two sets of windings, two switch modules, and an output capacitor Cout. One end of each switch module receives input voltage, the other end of each switch module is connected with the first end of the corresponding phase output coil in the inductance structure, and the switch control of a power supply is realized based on the connection and disconnection of a switch; the second end of each phase of output coil is connected with the upper polar plate of the output capacitor; and all interphase coupling coils in the inductance structure are sequentially connected end to end.
Specifically, each switch module comprises a first switch and a second switch, wherein a first end of the first switch receives the input voltage, and a second end of the first switch is connected with a first end of a corresponding output coil in the inductance structure; the first end of the second switch is connected with the second end of the first switch, and the second end of the second switch is grounded; the first switch and the second switch are opposite in switch state; and each switch module has a corresponding switch control signal. In this embodiment, one end of the first switch S11 in the first switch module 31 receives the input voltage Vin, and the other end is connected to one end of the first phase output coil 221a in the inductance structure; the other end of the first-phase output coil 221a is connected with the upper pole plate of the output capacitor Cout; the lower polar plate of the output capacitor Cout is grounded; one end of the second switch S21 in the first switch module 31 is connected to the connection node between the first switch S11 and the first phase output coil 221a, and the other end is grounded; in the first switch module 31, the first switch S11 is turned on, and the second switch S21 is turned off, and the first switch S11 is turned off, and the second switch S21 is turned on. One end of the first switch S12 in the second switch module 32 receives the input voltage Vin, and the other end is connected to one end of the second phase output coil 221b in the inductance structure; the other end of the second-phase output coil 221b is connected with the upper pole plate of the output capacitor Cout; one end of a second switch S22 in the second switch module 32 is connected to the connection node between the first switch S12 and the second phase output coil 221b, and the other end is grounded; in the second switch module 32, when the first switch S12 is turned on, the second switch S22 is turned off, and when the first switch S12 is turned off, the second switch S22 is turned on. In the inductance structure, a first inter-phase coupling coil 222a is connected in series with a second inter-phase coupling coil 222 b.
Specifically, as another example, the power supply circuit further includes a compensation inductor 4, and the compensation inductor 4 is connected between the first inter-phase coupling coil 222a and the second inter-phase coupling coil 222 b. The compensation inductor 4 may not be set when the negative coupling effect of the first inter-phase coupling coil 222a and the second inter-phase coupling coil 222b on the first phase output coil 221a and the second phase output coil 221b meets the application requirement.
It should be noted that, in this embodiment, the description is made based on two interleaved BUCK circuits, and in practical use, the number of parallel paths and the circuit structure of the switch module may be set as needed, which is not limited to this embodiment.
Specifically, the power supply circuit according to the present embodiment may obtain:
L1＝L2＝L
M13＝M31＝M23＝M32＝M
M12＝M21＝Ms
wherein L1 is the self-inductance of the first phase output coil 221 a; l2 is the self-inductance of the second phase output coil 221 b; m13 and M31 are mutual inductances between the first phase output coil 221a and the inter-phase coupling coils after series connection; m23 and M32 are mutual inductances between the second phase output coil 221b and the inter-phase coupling coils after series connection; m12 and M21 are mutual inductances between the first phase output coil 221a and the second phase output coil 221 b; va is the voltage at the second end of the first switch module 31; vb is the voltage at the second end of the second switch module 32; vo is the voltage of the upper plate of the output capacitor; i1 is the current flowing through the first phase output coil 221 a; i2 is the current flowing through the second phase output coil 221 b; ic is a current flowing through the compensation inductor 4, the first inter-phase coupling coil 222a, and the second inter-phase coupling coil 222b connected end to end, and L3 is a sum of inductances of the compensation inductor 4, the first inter-phase coupling coil 222a, and the second inter-phase coupling coil 222 b.
The three expressions (1), (2) and (3) can arrange the indirect coupling of the two paths of inductors into the relation form of the voltages at two ends of the common two paths of direct negative coupling inductors as follows:
based on the formula (4) and the formula (5), it can be seen that when the single-path inductive current changes dramatically, the other path inductive current also changes dramatically, and the current sharing of the inductor is realized.
It should be noted that, in practical use, the number of windings may be set according to needs, and as shown in fig. 7, four sets of windings are included, which is not described herein again.
Example two
As shown in fig. 8, the present embodiment provides an inductance structure 2, which is different from the first embodiment in that the inductance structure 2 further includes a bobbin 25, and the phase output coil 221 and the inter-phase coupling coil 222 penetrate through the bobbin 25 to fix the relative positions of the phase output coil 221 and the inter-phase coupling coil 222, so as to facilitate assembly and installation.
Specifically, in this embodiment, three sets of windings are taken as an example, and each set of windings is located in a corresponding through hole, and for a specific arrangement, reference is made to embodiment one and embodiment two, which are not described herein again. Each group of windings is fixed in the bobbin 25, the relative position of each coil is determined based on each through hole, and the bobbin 25 can be used for realizing the integral installation of each coil, so that the coil winding machine is convenient and quick.
More specifically, the bobbin 25 includes a fixing member 251 and an insert 252, as an example. The fixing member 251 is disposed outside the through hole, in this embodiment, the fixing member 251 is a cubic structure, and a lower surface of the fixing member 251 is attached to an upper surface of the magnetic core 21; the fixing member 251 is provided therein with through holes for receiving the coils. The plug-in units 252 are disposed on the lower surface of the fixing member 251 and are inserted into the through holes, in this embodiment, the plug-in units 252 include three plug-in units 252, each plug-in unit 252 is a cubic structure, a through hole is disposed in the middle of the plug-in unit 252 and runs through from top to bottom, the through hole of the plug-in unit 252 is communicated with the through hole in the fixing member 251, and the plug-in unit 252 wraps the phase output coil 221 and the inter-phase coupling coil 222 in the through hole.
It should be noted that the structure of the bobbin 25 is not limited, and any structure capable of fixing the positions of the coils to achieve convenient assembly and installation is suitable for the present invention. In this example, the fixing member is provided in a cubic structure in order to match with the structure of the magnetic core 21, and the structure of the fixing member is not limited in practical use; similarly, the structure of the plug 252 may be set based on the structure of the through hole into which it is inserted, and the plug can be installed, which is not limited to this embodiment.
It should be noted that the bobbin 25 can be applied to an inductor structure with two or more windings, which is not described herein again.
EXAMPLE III
As shown in fig. 9, the present embodiment provides an inductance structure 2, which is different from the first and second embodiments in that the line width of the phase output coil 221 disposed outside the through hole is larger than the width of the through hole.
Specifically, in this embodiment, four sets of windings are taken as an example, and each set of windings is located in a corresponding through hole, and the specific arrangement manner is referred to in the first embodiment, which is not described herein again. The line width of each phase output coil 221 (first line segment) located inside the through hole is equal to or less than the width of the through hole, and in the present embodiment, the line width of each phase output coil 221 located inside the through hole is equal to the width of the through hole; the line width of each phase output coil 221 (second line segment and/or third line segment) located outside the through hole is larger than the width of the through hole. The direct current resistance of the winding can be effectively reduced by widening the winding, and the inductance heat dissipation is easier.
It should be noted that the way that the line width of the phase output coil 221 disposed outside the through hole is greater than the width of the through hole may be applied to an inductance structure of two or more groups of windings, which is not described herein in detail.
Example four
As shown in fig. 10, the present embodiment provides an inductance structure 2, which is different from the third embodiment in that the bottom of the magnetic core 21 is a plane, and the wire outlet ends of the phase output coil 221 and the interphase coupling coil 222 are attached to the bottom plane of the magnetic core 21; and the welding resistance of the inductor and the PCB during welding is reduced by reversely folding the outlet ends of the phase output coil 221 and the interphase coupling coil 222.
It should be noted that the way of reversely folding the outlet end can be applied to the inductance structure of two or more groups of windings, which is not described herein again.
EXAMPLE five
As shown in fig. 11, this embodiment provides an inductance structure 2, which is different from the first, second, third and fourth embodiments in that the inductance structure 2 further includes at least one additional coil 26 and an additional through hole corresponding to the additional coil 26, and the additional coil 26 passes through the additional through hole and is wound around the magnetic core 21. The additional coil 26 serves as an additional magnetic circuit for adjusting the inductance of the inter-phase coupling coil, thereby adjusting the coupling coefficient between the phase output coil and the inter-phase coupling coil.
In particular, the number of said additional coils 26 can be set as desired; the positions of the additional coils 26 include, but are not limited to, the positions between the interphase coupling coils 222, the positions between the phase output coils 221, and the positions at both ends of the inductance structure 2, and are set according to actual needs. In this embodiment, the inductance structure 2 includes two additional coils 26, and the two additional coils 26 are respectively disposed at two ends of the three sets of windings; in order to adjust the inductance of the inter-phase coupling coil, the additional coil 26 is located on the same side as each inter-phase coupling coil 222. As an example, one end of the additional coil is connected in series with the input end or the output end of the interphase coupling coil, and the other end of the additional coil forms a new input end or a new output end.
It should be noted that the additional coil 26 may be applied to an inductance structure with two or more windings, which is not described herein again.
In summary, the present invention provides an inductor structure and a power circuit, including: the magnetic core comprises at least one magnetic core and N groups of windings, wherein each group of windings comprises a phase output coil and an interphase coupling coil; the magnetic core is provided with a through hole, the phase output coils and the interphase coupling coils of a group of windings penetrate through the same through hole and are respectively wound on two sides of the through hole, at least one group of windings are wound on one magnetic core, each interphase coupling coil is positioned on the same side of the magnetic core, each phase output coil is positioned on the other side of the magnetic core, and the phase output coils and the interphase coupling coils are arranged in an insulating manner; wherein N is a natural number of 2 or more. The magnetic core of the inductor structure adopts magnetic powder core materials, realizes negative coupling among multiple paths of inductors in an indirect coupling mode, and has the advantages of high transient response speed, small inductor size, strong heat dissipation capability and the like in large-current application. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (15)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040113741A1 (en) * | 2002-12-13 | 2004-06-17 | Jieli Li | Method for making magnetic components with N-phase coupling, and related inductor structures |
| JP2014199874A (en) * | 2013-03-29 | 2014-10-23 | 株式会社タムラ製作所 | Couple inductor |
| US8975995B1 (en) * | 2012-08-29 | 2015-03-10 | Volterra Semiconductor Corporation | Coupled inductors with leakage plates, and associated systems and methods |
| CN114068153A (en) * | 2020-08-07 | 2022-02-18 | 伊顿智能动力有限公司 | Low Profile High Current Coupled Winding Electromagnetic Components |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040113741A1 (en) * | 2002-12-13 | 2004-06-17 | Jieli Li | Method for making magnetic components with N-phase coupling, and related inductor structures |
| US8975995B1 (en) * | 2012-08-29 | 2015-03-10 | Volterra Semiconductor Corporation | Coupled inductors with leakage plates, and associated systems and methods |
| JP2014199874A (en) * | 2013-03-29 | 2014-10-23 | 株式会社タムラ製作所 | Couple inductor |
| CN114068153A (en) * | 2020-08-07 | 2022-02-18 | 伊顿智能动力有限公司 | Low Profile High Current Coupled Winding Electromagnetic Components |
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